Large dynamic range radar receiving system based on intermediate frequency shrot-range gain control

Abstract

The invention discloses a large dynamic range radar receiving system based on an intermediate frequency short-range gain control. The system comprises a circulator, a limiter, a radio frequency frontend, an intermediate frequency amplifier board and a trigger board. Radio frequency echo signals enter each member in sequence after being received by an antenna. The intermediate frequency amplifierboard comprises a low-noise intermediate frequency amplification circuit, a sea clutter detection circuit, a short-range gain control circuit, a band-pass selection circuit, an intermediate frequencylogarithm detecting circuit and a push-pull driving circuit. The trigger board comprises an FPGA, an A / D conversion module, a D / A conversion module, a signal buffer processing module and a storage module. The system performs short-range gain control on a radar intermediate frequency echo signal, transmits the intermediate frequency signal to the intermediate frequency logarithm detecting circuit to perform amplification, and then transmits the intermediate frequency signal to a data processing display through the push-pull driving circuit. According to the large dynamic range radar receiving system based on the intermediate frequency short-range gain control, the saturation problem of the close-range echo is overcome, and the dynamic range of the receiving system is maximized, so that theshort-range small target is clear. The data processing display is connected with the trigger board by serial port control.

Description

technical field [0001] The invention relates to the technical field of non-coherent radar reception, in particular to a system for performing short-range gain control on intermediate-frequency echo reception signals of marine navigation radars to maximize the dynamic range of the radar reception system. Background technique [0002] Marine navigation radar is mainly used for detection and tracking of maritime targets, assisting ship navigation and collision avoidance, and ensuring navigation safety. With the increasing complexity of the ship's navigation environment, the performance of navigation radar, especially the ability to detect surrounding targets under sea clutter conditions, is directly related to the safety of ship navigation and the safety of related personnel. How to enhance the detection ability of small targets under sea clutter, such as smaller ships, has always been the focus of current marine navigation radar technology research. [0003] The so-called sea...

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Problems solved by technology

[0008] The purpose of the present invention is to overcome the defect of short-range echo saturation in the existing mainstream receiving system that adopts the method of logarithmically amplifying and detecting the intermediate-frequency echo signal and then performing short-range gain control, and provides a method that can effectively overcome the short-range echo. Wave Saturation Problem, Maximizing the Dynamic Range of the Receiver System in a Radar Receiver System

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